The choice of three viscosity grades (Light, Medium, and Heavy) allows the professional to maximize the performance of the instrument's action by selecting the lubricant grade that is best suited to the instrument. The use of the proper viscosity key lubricant ensures an action that is quick, crisp, smooth, and quiet. Hetman® Synthetic Key Lubricants are nontoxic, long-lasting, non-gumming, and plastics-safe. Each lubricant is packaged in a 22 ml precision needle oiler dispenser making application simple, neat, and efficient.